Dr. Jiangning Zhou Profile

Dr. Jiangning Zhou

at CARDC

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Publications (3)

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Proceedings Article | 18 March 2021 Paper

Instantaneous temperature measurement of supersonic combustion using coherent anti-Stokes Raman scattering

Wenbin Yang, Xinhua Qi, Jiawei Ye, Meng Li, Jiangning Zhou, Shuang Chen, Jinhe Mu

Proceedings Volume 11780, 117800L (2021) https://doi.org/10.1117/12.2589673

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A single-laser-shot N2 Q-branch Coherent Anti-Stokes Raman Scattering (CARS) is used to measure the instantaneous temperature of supersonic combustion in kerosene/air flame with Mach 2.6. The Unstable-resonator spatially enhanced detection (USED) phase matching is used to reduce turbulence effects and to improve the CARS signal intensity. An USED CARS measurement system, which has a high spatial solution of ~100μm in diameter, and a CARS spectrum calculating and fitting program CARSCF are developed. The CARS signal in supersonic combustion is measured and then used to calculate temperature, the results show that, during kerosene/Air ignited in Mach 2.6, the CARS signal first rise rapidly then fall sharply and finally rise slowly, while the temperature increase sharply and then decrease slowly and the average temperature is 1970 ± 144K with 6.5% of repeatability.

Proceedings Article | 18 March 2021 Paper

Effect of nanosecond pulse discharge on emission spectral behavior in CH4-air diffusion flame

Jiangning Zhou, Quan Zhou, Wenbin Yang, Shuang Chen, Bo Yan, Linsen Wang

Proceedings Volume 11780, 117800E (2021) https://doi.org/10.1117/12.2589032

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A nanosecond pulsed dielectric barrier discharge (ns-DBD) setup is built to preliminarily analyze effect of different discharge repetition (600Hz ~ 1800Hz) and voltage (6.0kV ~ 10.4kV) on CH4-air diffusion flame. Emission spectral is used to understand temperature and relative change of components’ concentrations in diffusion flame, such as O radical (777nm band), OH radical (308nm band). Plasma induced consumption process of repetitive pulsed nanosecond discharges on O radical has been directly observed at 900Hz discharge repetition. Based on time resolved emission spectral, significant changes of OH radical distribution at early discharge stage can be observed, which can be due to air-discharge plasma, and rapidly recover in microsecond scale due to rapidly consumption of generated OH radical. Besides, great differences in reaction time scale of OH radical (half-value period of OH radical consumption ~81.8μs) and O atom (half-value period of O atom consumption ~3.6min) is observed, corresponding to different chemical reaction mechanism of O atom and OH radical. A model based on rate equation is built to describe generation and consumption process of O atom and OH radical, which can also well predict voltage behavior of 777nm band at steady state (6.0kV ~ 10.4kV).

Proceedings Article | 29 March 2019 Paper

A non-linear temperature calibration equation for filter selection in 2-D LIF thermometry approach

Jiangning Zhou, Yimin Yin, Wenbin Yang, Shuang Chen, Bo Yan, Jinhe Mu, Xinhua Qi

Proceedings Volume 11046, 110461J (2019) https://doi.org/10.1117/12.2523276

KEYWORDS: Signal to noise ratio, Laser induced fluorescence, Thermometry, Rhodamine B

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Due to non-interruption of laser intensity and dye content, two-colour Laser Induced Fluorescence (LIF) ratio thermometry approach is widely used in the studies of fluid. Ratio of temperature sensitive dye Photo Luminescence (PL) intensity at two wave bands with different temperature sensitivity can efficiently remove interruption of laser intensity and dye content in time and space. To achieve high temperature sensitivity and Signal to Noise Ratio (SNR) in these technique, selection of two wave bands’ peak wavelengths and band widths should be carefully considered. In this work, influences of peak wavelengths, band widths and SNR to temperature sensitivity of this two-colour LIF ratio thermometry approach are discussed. Temperature property of a traditional temperature sensitive dye (rhodamine B) aqueous solution is studied in a wide temperature range from -10°C to 90°C by spectroscopic method. A non-linear fitting method based on Arrhenius equation is present to accurate describe rhodamine B PL intensity decay along with increasing of temperature, achieving significant improved fitting accuracy compared with traditional linear fitting model. Based on this non-linear fitting method, influences of filters’ center wavelengths and band widths to temperature sensitivity are analyzed. These results give very important information of filter’s selection to ensure sufficient temperature sensitivity and SNR in two-colour LIF ratio thermometry approach.

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